Pump



i Fig. 1 is a section through the Patented duly 149 "1Q/259 Urrea STM.-

Jenn a. annum, or ac s'anennns, oamrcaura.'

anni.

anni y erica application. una December indaga. serial mi. 679,977.

To ail may concern:

Be it known that L donn ZUBLIN, a citizen of the Republic of Switzerland9 residing at Los Angeles, inthe county of Los Angelesa State of. California, have invented conditions are ordinarily found in' pumps4 applied to oil and water wells and for many other applications. 15.

Under such 'conditions the wear upon the plunger and the pump barrel yof the usual 'forni of pump is considerable.; 1 have found, however,' that if the plunger be provided with a sharp upper' edge and this edge be maintained .atintimate contact with thepump barrel walls,

it .is possible to prevent the entry of the the plunger and the wall of the pump barrel, and thus greatly reduce the cuttin ac-v tion on the plunger and pump barre I have found further that it is possibleby a5- suitable design of pump to make an edge which is not onlyeXtremely-sharp initial y .but which maintains itself. in this condition over long periods .of use. This is accomplished by subjecting this edge to' swagf` ing action through fthe operation of the4 pump, as will hereinafter be explained.

Further objects and advantages will be made evident hereinafter. lieferring to the drawings which are for illustrative purposes' only,- c

barrel and plunger of an yoil Weli pump embodying my inventionl.

Fig. 2 is a similar section through an al= ternate form of my invention.

Fig. 3 is a plan view of the plunger used in the -form shown in Fig.. 2Q

Fig. 4 is a section through thepump rod on a plane'represented by the line 4-.401

Fig. 2, the plunger and barrel beingomitV ted for the sake of c lcarness.

In the form of the invention show''in" Fig. 1, a hollow plunger 11 is. fitted inside a pump barrel 12, being reciprocated by. a pump rod 13 having a conical seat 14 on which the plunger 11 seats on the up stroke. Secured on the pump rod 13 is a cage 15 having openings 16 therethrough and hayu ing a ring 17 on the lower end thereof.' The plunger and -make rupper end of the plungerlil is preferably' conoidal and the lower endy of lthe member 17 is of such a shape as to fit-therein. On

the up stroliethe plunger- 11 rests upon. theseat 14: but as thepump rod 13 starts upon downwardly' by the cage 15. .Art the' beginning, therefore, of eaehdown strolrefthe plunger 11 is st-ruck a light blew by' the portion 17 ofthe cage 15, the conoidai lower surface of the member 17 being forced in 1l, thus tending to spread or expand the plunger -ll'and to` maintain a sharp knifev edge having the form shown at 2O in Fig. 1.

This sharp ed e fits ti, ;htlyv inside thebarrel 12 and ten s to scrape from the walls of r y the barrel any adhering mud 'or other abrasive material into the' space between abrasivematerial which is thereoni'thus pre venting the abrasive from entering the space between the plunger 11` and the barrel 12.

In the form of the invention shown in Fig. 2 1 provide a pump barrel 50 having a plunger 51. A pump rod 52 extends down wardly and is provided with a seat 53 at the lower end thereof and a cage 511 at the top thereof.l The seat 53 is a yfreely slid ing itinside the barreland'is provided with 70v i side the coz-acting surface of the plungerI saw cuts55 .which extend vertically therethrough arouid'the edges thereof. and pro- .vide'channels' threugh which the fluid may flow on the downfstroke of the pump The lower `'end of the'plii-nger V51 is conoidal in form and -it-is subjected. to the same swaging action 'as the edge 2() mentioned in connection with Fig. 1. ln other words, on

'the down stroke the'plunge'r 51 is in its upper' position resting against the member 54.

and it remains in 'this position until it yreaches -the "bottom of its stroke and the pump rod 52 starts upwardly. At the start,

`of the up stroke of the pump rod 52 the plun er 51 is stationary andffis4 therefore struc a sharp blow' by the seat 53, thisbl'owy i' tending to swageout the lower edge of the it f it tightly inside the barrel 50.-

lIt is not absolutely necessarythat the edgesof lthe plunger should be conoidal and the arrangement shown in the upperv portion of Fig.\ 2 is fairly eiiiciente In this form the lower portion of the cage '54: strikes against the vupper end of the plunger 50,

tendingy to` swage it outwardly and make it ,fit tightly against the inner walls of the barrel 50. y I claim a'smy invention: 1. In a pump, the combination of:'a pump barrel; a hollow-piston fitting in said pump barrel; va pump rod; and means on said pump rod for operating said piston, said means beingV so arranged as to batter out a thin edge of said piston againsty the pump barrel. y

2. In apump, the'combination-of.: a pumpe barrel; a hollow piston fitting in said pump barrel'vand having a sharp edge at one end thereof in Contact with the inner surface of said pump barrel; a pump `rod; and meansyon said pump rod `for plunger against'said barrel.

3. In a pump, the combination of: a pump barrel; a piston itting in said barrel, said piston having a sharp edge at its point of Contact with saidbarrel; and means for swaging said edge by 'the operation ofsaid pump to maintain it in intimate 'contact with said barrel.

swaging said 4. In a pump, the combination of: a-pump barrel; a piston fittingl in said barrel and having 'a sharp edge in intimate contact with said barrel; a pump rod; means for attaching said pump rod to said plunger 1n such a manner that there is a slight lost .motion between said pump rod and said plunger; and meansA for utilizing said lost motion to swage said. s har'p edge against the .inner surface of said barrel.

5. lIn a'pump, the combina-tion ofi a pump barrel; a piston fitting in said vbarrel and having a sharp edge iin intimate Contact with said barrel; a pump rod; means for attaching Said pump rod to said plunger in such a mannerthat there is a slight lost motion between said pump, rod and said plunger; and means carried'by said pump rod for striking a sharp blow on said plunger closelyiadjacent the wall of the barrel at the beginning of eachstroke of the pump.`

In testimony whereof, I have hereunto set m hand at Los Angeles, California, this 4th day of December, 1923. l JOHN A. ZUBLIN. 

